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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18326a316da207613dc913d3587b05f14940fb51ecf66f0094143916f30c6e47' 
  AND token = 'Wgqj4q3+0NMk2G8mkSA3a0qqoV092u4+KV0s5RuRoi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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