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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34460afbfe90fc25fe1855071eedd07884632a8cf7814ea465e42dbe8d40962' 
  AND token = '88yznGVphkPbrdM3wsRuF+Z0J4m6M6iliCfF6XehsE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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