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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff11322369c8259a0bf86037823b3a442278b614b28e55d1fd5dc8b732eea9c1' 
  AND token = 'RdY26bJSTQUfOls7Bgmp2oZFAY3estLrtPHpXVp5Ces=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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