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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2860422a62b86c437039cb0e57bb98c01a6a67c9f461763344f2b5cbe15f68' 
  AND token = '77tkRL4PE9KaNHwa/cM2yZitVW+CkoLzreuYRTHNcy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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