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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb7759beb321c4eede788f7cb7a3278038829fe1dd1cd26c72c89d334d145dd' 
  AND token = '3s7KfVhoaRnCq4IgdNoh5QxJThCYzpz2BouhU1J8+tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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