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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788310e9a2c5e229c61bf7d8c9b65331699c47b125b453313aa2b21ee133139b' 
  AND token = 'ZMMHD099yEf7IADTfTKnndBJOTJfYAaOp78MSFa2f4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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