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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81caf0b408fd1a0fab081dceddf08e90b52d2c7002f697154056abeaf447d89' 
  AND token = 'Hg3HE2S7D8F4F7FRU3l5MOesDmJ/p+h1aud9Ml1fjdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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