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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61db520d7490fa969460d759153fb43d6abe394c2e0fef409e40f7583fd9a45' 
  AND token = 'd+dEdF2z4lSYsUmYVnZb7UVuPoBODsAtiuxo3/Evavw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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