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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adb2e497cd4ef0d52171b895b9939b4b1a7e1d3d9dd00e2423a4e1ae14a0896' 
  AND token = 'y9F8LBLpy/0WHml7lnb5FWp+ytiLw8hqVOYJJ97OrxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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