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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d07559892fbdf2ed204b7212b6f00626a8283a89136fe1d411492117abf0733' 
  AND token = 'M4lmmZe7HAFkc9MBfY5nhSjC2lOq70eApS2LDwoaWhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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