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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe52ecb496eecd12c8a588f00d2ee10f6d20f20edf2757f8b0d57f25c73ab88' 
  AND token = '1L5DPtuNG25fFtw50ECBSUghPMX3lcni+UU8e8uqKHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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