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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0da4337b429928148164713d53586ec82535abb9317fd65b5d6abb1f8ccd9da' 
  AND token = 'mAoQR3zSM8iaTzcLmZZdKjqxE0txrl/hlREqlJzorp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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