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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4050b85b1dcbef75b10838909a49b4a8aff34e1a0571db38d69ebd344e4d55' 
  AND token = '3kMBDUfe3fjUcTYDlq17qddxT2+Qxl5VknDtHwa7TGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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