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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5480f66385ef1803fe831c3d725efcc3ea4709c768162722799d258f13e17a8' 
  AND token = 'b7RvRaLGMxTi7p3T496DlCTSEPBN5louG+AerU6/bKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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