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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9b971d7823c8cb37a9d9a650ebb0ba5b9b8498e856611a9f82c703f97d8acb' 
  AND token = '90eb1t3Kx3798DrVOSi14E2fy4QlV/RbxbtVlSeoVqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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