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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36927e8b56643618f7864ec4273ea399169a7a5de86d78063e029aa9a8ed0e7' 
  AND token = '7tJPUNLPgpu+eRPvmhcpHWREzgKwfvbrHEAY15Q1BNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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