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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5823494b584e57cd7a822a8afd9139c213b7e4cc613d4f4f53cfb0cfaec1b09' 
  AND token = 'Q29aPquwHO/cBBWwv1km94OSXfp/SfRm/yIfTG2f2dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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