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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8a6dbd6846eaef6981cfc6aa097065911cd25df68fef9bc8d29c027f2a6260' 
  AND token = 'rv1R3kaCMSAol337C77tLXRELIhlyzwf/4Vc0cGlJL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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