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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51de22411a259d2966217e7f3a19f97ba66771c79010f9890d4d7c39fe5f04ed' 
  AND token = 'NLFhGPmMgAjBCDHT623/upCdAMz5FSH0xgNFNwVdMBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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