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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd70a093d5b04bf692038c32789332182c1c4fe64fe54a72f9ec64ed2808b59' 
  AND token = 'KClh85CYlvrR+NQp6D5MKvUyawRR7oDnR0v8aWZO2Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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