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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3495e0077f42004db62d7ced66ec27c0ceed9cb28db406a05388325fd7f849b1' 
  AND token = 'qc4JOOPrGp8UBIDO2OOtzLmS5lDyR9cuteRkmMk3CxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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