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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15147cd20c93097a320cca93fcfb775b7fc6e3bc4273ff4d7d663b26016fd634' 
  AND token = 'BgSrVa2gT4vhvL306NmJgpDJH9bUhoNXj+QdgpFPiUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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