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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8d12408c9a9ae9f22143007ae10af71960cdf54889ac0beb6d222ab212c12e' 
  AND token = 'tx2y+XhY0PwAz9bcGvlOapa83q2u00b2P3UbIDlI/dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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