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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26594a94697a2702792d1f864b44a9e5fcb7810ff8333754fc509c7428c3e6ef' 
  AND token = 'c901JaUPU/o3JbY5SkYZlljbmYSpaEj3vvWfZKblJe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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