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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0578224ddfe7b079d50ee1aa01d0f43e70d7e0204755fc012f00f76c1b13037e' 
  AND token = 'kcrEAsshGX2i+y0halHJkedBa5PNAqjFNbm4tHDFUBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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