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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1c6ab57f41c3480b34814ded51b696ab3c67e0afdb41a33a7e1120a9432aa9' 
  AND token = 'golFxtTghmipn78NLyI6sQtdiJOV+tfzUgOOlfJSnb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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