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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7c0605828f933071a03807d9f7e386bf4708dfce07521651b866c3d72dc442' 
  AND token = 'oo8Kw6TVRvJJyvpdoBqxwk27E13MG7U4quYPFV+aM0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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