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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9485beb3920e7eb26fc2ab8171df526b808916f5bc8a350af5d45ce06a50e50b' 
  AND token = 'vEtazP1FShxdVvmt7VLfzSJFfa9mN2kF1SO3ZK0mH2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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