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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0737c90676a1e33f0612f9475763ad8ca2eb7e171eeacfeadd6eb4f0e9731a' 
  AND token = 'G9oa2txZ80aEss3G1Rn/R+POnAnxUhTw81P1zPcZppo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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