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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28939670d1886e8ae3a7fbf546fe22dc9e30fbbfa4c4e61bd6103e4d075cea6a' 
  AND token = 'ydKgSqvC+wNespjqXamX7htO+D7M3taDbn1Ge2kFqoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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