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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d76945667be274b878814fb2d352d1699515e10f26f4a78fa0f84f9e6e58252' 
  AND token = '61/UDjkKB7CDEvJOIek5SheCSHerQuAZT1KU8KeY1pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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