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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9608c1907dcd85b8dcd169ae0c4339c61e817e6a755d65b89fb1dd153d2453e' 
  AND token = 'FcXITMzJDNeNt11K3B9WYXBdRZlJUHvcZAdj87bPJH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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