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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87a2c7032b98e21861321dde2ed1c944ef6025c2154e9c47dd384e0306bf1e8' 
  AND token = 'e7aZvTummY253sgkDqxlw7b9bFDY1R4JWOZa/9Fu52g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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