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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026aa0ccaf0bfdffebaaf7fe72a96360043b98f1d8b7a49d186c8cce60cd5df1' 
  AND token = 'evUfsxbEALI6p2L/Nec4FHOmJMBlJYfqZ41rOVMuF88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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