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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58eb2b3781be613cfa535e3a26e7a8b08fe7e63361a8bfb6b2f430f6ad227938' 
  AND token = 'z+TywGe3ytn/JamgzxSNTP3AiniI8x7a3NteTJ97p5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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