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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036b927c26f1320190c6ab75dfe246dc40ddd43637e22b2531237f15d856f0c5' 
  AND token = 'lFbhgVyQnu9GtKZJno7UZmsB320T7qD701szrWTPfL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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