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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1251a880918cc52de3e6e4f644b2c6365bc960aa756c1dfce15e71ad987f8bd1' 
  AND token = 'dhDQ5ClaD7IBjpMN6LWTLzErZq5EQfKtWMQllrssBAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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