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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a634f6ebec2349562280e4019351cd94c37dee598891e12966ac926c2601dd2' 
  AND token = 'epjS8VtoCNCSUEunYbnzD4H8BqekHIhE2pl5ATKAf0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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