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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8646042efe9402ac822c0420c4f2e9cfc09239a185b49efcd61f95abee4841' 
  AND token = 'o59BnjXL6TY5pZALT0Xdl2325U8gJuFO6fxAAjC247A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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