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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9ff15a4811c592fa203fa49fd91f1c914f844c79c0c79c15bb21fce543bead' 
  AND token = 'zyx+bypI2qUQjSCberhBE4qu9zXleQhmkpw8Iz4rtJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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