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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93238830ec3f2fca27072e09193fdbbf606a83ff41ee72c9a82eb0a3f915550e' 
  AND token = 'PoNoPWNUNwA0Yk5fM3FRSn/pXyC2s//lJbBP2z8Zpyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}