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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f54b88903542d5b843e0c0cf62ab1e120227734f61cb2aef7334f673f0e8ef' 
  AND token = '+T8QL7/Jk5q7Ibm8wB6Laot3b7Xu4aCA6J32NI5GICY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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