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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb60799db74be3a7f196bfdef95659d47dab07394e7afa87afcbab97e1d9f34' 
  AND token = '/wOvbvf4Z/Ged5A2pvrBBKY7/gKVM+Qrm4aiBFe7YR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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