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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dc4aff002fad815542c9f4b774a3d1c2ef39b4dc539f591b4e5db21a9e1980' 
  AND token = 'SweRnBOB25HnLeCjppKlfHreIBf2BoHBV/qC8wdnfJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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