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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33e3819f51be1a29775d87219b76577c627309534c736f6c3cea3d147579e4e' 
  AND token = '87+TCX7/7eEP3zy97kjABFX4tH09CL64dSE99D5is9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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