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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2617187a0f743429454331a8fb2b94a8e86a4ffb88732bdaae94560ce12fa07b' 
  AND token = 'Qg5paCpBhZcE3HZbm2kOZpps/1B6RQTzHuvTnDhI2oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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