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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758f27df9c00d06c51176633102af78350c6390bc1c4648197d579bcf877784b' 
  AND token = 'hU1CRdrkYoxhvLd5frMKZOqrl983uPDXbzSTaEM59v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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