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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8feacaca2e38e532ecc4547c9d16be38a157b2a4352c4e9d9d5ca51809a6d465' 
  AND token = '4PMZOVcoU/Nbr389vPmYJULbHyVIZUQ+0a9W8d+D/E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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