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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5b1e6a61f7d4d9cfda9b18d5a4336df9df4769f153eb036b81d39597c35d47' 
  AND token = '8L3miojS9csd/B8OHCrJ5xxcajZ4axgGGTlSLbH386c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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