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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63de90ed87e279663578cc69bde67ae51f8947ff2c508075986fbc8bb63e7b9c' 
  AND token = 'V1Hc0t1JoVy3r8el29M5cY7q0jtGHflclluDEU8XD7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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