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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bad1489cc202369c9c5216d26a641fc0db125e968c68fa5aca9ba6b43389a5' 
  AND token = 'u2r2HPNLCUzPsQ5KOUaI5CzeEXBam36g2qD/wmjWQH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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