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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3b06ae9a89b075289867d14f0d41aea961f2a7844ec2b6332c5c5efbe59d58' 
  AND token = 'Ujp8JAxmvypMdJ7rfTgblgPP1gQX4Jb4LazVCrcHH6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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