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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ec5eaf6fef1bbf9cfcaec05f58403f77753971178bd86e7e97826d335a5a99' 
  AND token = 'URgvy1Hzgkhiv905Mz2wHsHjOnnAnGoFSQ5P+3oAVe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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